Synthesis, crystal structure, and electrode characteristics of LiMnPO4(OH) cathode for lithium batteries

The electrochemical properties of lithium manganese hydroxyphosphate, LiMnPO4(OH), with the tavorite structure have been investigated to assess its suitability as a cathode material for lithium batteries. Stoichiometric LiMnPO4(OH) was synthesized by an ion-exchange reaction with MnPO4·H2O and LiNO3. Lithium (de)intercalation reaction was observed for the first time in the trivalent LiMnPO4(OH), and it exhibited a reversible capacity of 110 mA h g−1 with an average cell voltage of 3.4 V (vs. Li) after an irreversible phase change during the first charge process. The crystal structure has been refined at room temperature by neutron and synchrotron X-ray diffraction data using Rietveld method with a space group of P−1. The hydroxy group at a bottleneck may reduce the attraction force between lithium and the bottleneck oxygen ions that thus increase the ion mobility along the lithium diffusion tunnel.

Tavorite-type material LiMnPO4(OH) shows lithium intercalation at an average voltage of 3.4 V (vs. Li) after a phase transition during the first charge–discharge. Figure optionsDownload as PowerPoint slideHighlights
► Tavorite-type LiMnPO4(OH) nanoparticles as a cathode material for lithium battery.
► Synchrotron XRD and neutron diffraction refinement of LiMnPO4(OH).
► Lithium intercalation reaction occurs in LiMnPO4(OH) during charge–discharge.
► A phase transition in the first charge, followed by a reversible reaction.